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A comparison of morphokinetic markers predicting blastocyst formation and implantation potential from two large clinical data sets

  • Assisted Reproduction Technologies
  • Published:
Journal of Assisted Reproduction and Genetics Aims and scope Submit manuscript

Abstract

Purpose

To demonstrate whether the standard morphokinetic markers used for embryo selection have a similar relationship to blastocyst formation and implantation in two large clinical data sets.

Methods

This is a retrospective cohort analysis striving to answer two distinct questions utilizing data sets from two large IVF clinics. Blastocysts (BL) and implanted blastocysts (I) in both clinics, IVI-Valencia (BL = 11,414, I = 479) and WMC (BL = 15,902; I = 337), were cultured in a time-lapse system (EmbryoScope, Vitrolife, Sweden). The study was designed to assess the relationship between early morphokinetic hallmarks and BL development, with a secondary analysis of implantation rates following single-embryo day 3 and day 5 transfers.

Results

We performed a detailed graphical analysis for t3, t5, duration of the second cell cycle (cc2) (t3-t2), and the ratio (t5-t3)/(t5-t2). The t5 timing was not affected between the clinics. However, Weill Cornell Medicine’s (WCM) proportions were significantly affected by having BL vs. not. A significant decrease of blastocysts with longer t5 in WCM data, while t5 was more informative in the IVI data set for the implantation rate.

Conclusions

Morphokinetic intervals for early cleavages were distributed differently between the clinics. Incorporation of embryo-selection algorithms depends on the individual clinic’s selected developmental hallmarks, all of which must be validated before incorporation into clinical practice.

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Correspondence to N. Zaninovic.

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Zaninovic, N., Nohales, M., Zhan, Q. et al. A comparison of morphokinetic markers predicting blastocyst formation and implantation potential from two large clinical data sets. J Assist Reprod Genet 36, 637–646 (2019). https://doi.org/10.1007/s10815-018-1396-x

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  • DOI: https://doi.org/10.1007/s10815-018-1396-x

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